/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.index.query;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Filter;
import org.apache.lucene.util.automaton.Operations;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.BytesRefs;
import org.elasticsearch.common.lucene.search.RegexpFilter;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import org.elasticsearch.index.mapper.MapperService;
import java.io.IOException;
import static org.elasticsearch.index.query.support.QueryParsers.wrapSmartNameFilter;
/**
*
*/
public class RegexpFilterParser implements FilterParser {
public static final String NAME = "regexp";
@Inject
public RegexpFilterParser() {
}
@Override
public String[] names() {
return new String[]{NAME};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
boolean cache = true;
CacheKeyFilter.Key cacheKey = null;
String fieldName = null;
String secondaryFieldName = null;
Object value = null;
Object secondaryValue = null;
int flagsValue = -1;
String filterName = null;
String currentFieldName = null;
int maxDeterminizedStates = Operations.DEFAULT_MAX_DETERMINIZED_STATES;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
fieldName = currentFieldName;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else {
if ("value".equals(currentFieldName)) {
value = parser.objectBytes();
} else if ("flags".equals(currentFieldName)) {
String flags = parser.textOrNull();
flagsValue = RegexpFlag.resolveValue(flags);
} else if ("max_determinized_states".equals(currentFieldName)) {
maxDeterminizedStates = parser.intValue();
} else if ("flags_value".equals(currentFieldName)) {
flagsValue = parser.intValue();
} else {
throw new QueryParsingException(parseContext.index(), "[regexp] filter does not support [" + currentFieldName + "]");
}
}
}
} else {
if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else if ("_cache".equals(currentFieldName)) {
cache = parser.booleanValue();
} else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
cacheKey = new CacheKeyFilter.Key(parser.text());
} else {
secondaryFieldName = currentFieldName;
secondaryValue = parser.objectBytes();
}
}
}
if (fieldName == null) {
fieldName = secondaryFieldName;
value = secondaryValue;
}
if (value == null) {
throw new QueryParsingException(parseContext.index(), "No value specified for regexp filter");
}
Filter filter = null;
MapperService.SmartNameFieldMappers smartNameFieldMappers = parseContext.smartFieldMappers(fieldName);
if (smartNameFieldMappers != null && smartNameFieldMappers.hasMapper()) {
if (smartNameFieldMappers.explicitTypeInNameWithDocMapper()) {
String[] previousTypes = QueryParseContext.setTypesWithPrevious(new String[]{smartNameFieldMappers.docMapper().type()});
try {
filter = smartNameFieldMappers.mapper().regexpFilter(value, flagsValue, maxDeterminizedStates, parseContext);
} finally {
QueryParseContext.setTypes(previousTypes);
}
} else {
filter = smartNameFieldMappers.mapper().regexpFilter(value, flagsValue, maxDeterminizedStates, parseContext);
}
}
if (filter == null) {
filter = new RegexpFilter(new Term(fieldName, BytesRefs.toBytesRef(value)), flagsValue, maxDeterminizedStates);
}
if (cache) {
filter = parseContext.cacheFilter(filter, cacheKey);
}
filter = wrapSmartNameFilter(filter, smartNameFieldMappers, parseContext);
if (filterName != null) {
parseContext.addNamedFilter(filterName, filter);
}
return filter;
}
}